Xióngxìng báiméi chángbìyuán de méimáo chéng báisè, yīncǐ démíng.
Male hoolock gibbons have white brows, which is how the species got its name.
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Parse as 白眉 (white-brow) + 长臂猿 (gibbon, literally 'long-arm ape'). The name describes exactly what distinguishes them — bright white brow tufts on a dark face.